"Jamal has been first class for us and he has real quality which is well above League 2 level, so it's fantastic for us to be able to keep him for the rest of the season,” Wycombe boss Gareth Ainsworth told the club’s website.

"He commands his area superbly, his distribution is outstanding and he's made some saves which are out of this world to help us pick up some valuable points.

"I'd like to think we do things right here when it comes to developing young players and Jamal is another example of someone who's come in, worked hard and improved his game with us.”

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Blackman, 23, is yet to make a senior appearance for Chelsea

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Blackman is a product of Chelsea's youth academy

Blackman progressed through the Chelsea academy set-up and boasts a handful of England caps at various youth levels.

The 6ft 6in goalkeeper made his professional debut while on loan at Middlesbrough in a League Cup clash at Liverpool, where the hosts won 14-13 on penalties after a 2-2 draw.